Novel Interconnects Manufactured By Powder Metallurgy For Solid Oxide Cells Applications

Authors:

Mari Carmen Monterde (AMES PM Tech, Spain),
Lucile Bernadet (IREC, Catalonia Institute for Energy Research, Spain),
Emilio Jimenez-Piqué (UPC (Universitat Politécnica de Catalunya), Spain),
Marc Torrell (IREC, Catalonia Institute for Energy Research, Spain)

Abstract:

This work presents SOC interconnects produced by powder metallurgy. Ferritic stainless steel and modified-ferritic stainless steel with Y2O3, have been studied as interconnect materials for SOC tested. Chemical composition effect and chromium content, thermal expansion coefficient, oxidation kinetics and area specific resistance were studied and discussed. In this regards, thermogravimetric analysis during 3500h at 800ºC under oxidizing atmosphere are presented and discussed. Moreover, long-term solid oxide electrolyze mode under 0.25 A.cm-2 at 800ºC in Air|90H2O|10H2 for 700h suffer a soft degradation. Use of conventional MnCo spinel chromium-getter coatings have also been studied. It was confirmed by FIB test that MnCo2O4 coating retain the volatile chromium species in order to avoid the poisoning of the cell. The obtained results indicated that ferritic stainless steel interconnect manufactured by powder metallurgy with a lower content in chromium than Plansee’s interconnect are a potential alternative to be considered.

DOI:

https://doi.org/10.59499/WP225371861